#include <errno.h>
#include <assert.h>
+#include <systemd/sd-event.h>
+
#include "jobs.h"
#include "sig-monitor.h"
#include "verbose.h"
unsigned dropped: 1; /**< is removed ? */
};
+/** Description of handled event loops */
+struct events
+{
+ struct events *next;
+ struct sd_event *event;
+ unsigned runs: 1;
+};
+
/** Description of threads */
struct thread
{
- struct thread *next; /**< next thread of the list */
- struct thread *upper; /**< upper same thread */
- struct job *job; /**< currently processed job */
- pthread_t tid; /**< the thread id */
- unsigned stop: 1; /**< stop requested */
- unsigned lowered: 1; /**< has a lower same thread */
- unsigned waits: 1; /**< is waiting? */
+ struct thread *next; /**< next thread of the list */
+ struct thread *upper; /**< upper same thread */
+ struct job *job; /**< currently processed job */
+ struct events *events; /**< currently processed job */
+ pthread_t tid; /**< the thread id */
+ unsigned stop: 1; /**< stop requested */
+ unsigned lowered: 1; /**< has a lower same thread */
+ unsigned waits: 1; /**< is waiting? */
};
/* synchronisation of threads */
static int started = 0; /** started count of threads */
static int waiting = 0; /** waiting count of threads */
static int remains = 0; /** allowed count of waiting jobs */
+static int nevents = 0; /** count of events */
/* list of threads */
static struct thread *threads;
/* queue of pending jobs */
static struct job *first_job;
-static struct job *first_events;
+static struct events *first_events;
static struct job *free_jobs;
/**
}
/**
- * Adds 'job1' and 'job2' at the end of the list of jobs, marking it
+ * Adds 'job' at the end of the list of jobs, marking it
* as blocked if an other job with the same group is pending.
- * @param job1 the first job to add
- * @param job2 the second job to add or NULL
+ * @param job the job to add
*/
-static void job_add2(struct job *job1, struct job *job2)
+static void job_add(struct job *job)
{
- void *group1, *group2, *group;
+ void *group;
struct job *ijob, **pjob;
/* prepare to add */
- group1 = job1->group;
- job1->next = job2;
- if (!job2)
- group2 = NULL;
- else {
- job2->next = NULL;
- group2 = job2->group;
- if (group2 && group2 == group1)
- job2->blocked = 1;
- }
+ group = job->group;
+ job->next = NULL;
/* search end and blockers */
pjob = &first_job;
ijob = first_job;
while (ijob) {
- group = ijob->group;
- if (group) {
- if (group == group1)
- job1->blocked = 1;
- if (group == group2)
- job2->blocked = 1;
- }
+ if (group && ijob->group == group)
+ job->blocked = 1;
pjob = &ijob->next;
ijob = ijob->next;
}
/* queue the jobs */
- *pjob = job1;
+ *pjob = job;
}
/**
* Get the next job to process or NULL if none.
- * @param job the head of the list to search.
* @return the first job that isn't blocked or NULL
*/
-static inline struct job *job_get(struct job *job)
+static inline struct job *job_get()
{
+ struct job *job = first_job;
while (job && job->blocked)
job = job->next;
return job;
}
+/**
+ * Get the next events to process or NULL if none.
+ * @return the first events that isn't running or NULL
+ */
+static inline struct events *events_get()
+{
+ struct events *events = first_events;
+ while (events && events->runs)
+ events = events->next;
+ return events;
+}
+
/**
* Releases the processed 'job': removes it
* from the list of jobs and unblock the first
free_jobs = job;
}
-/**
- * Releases the events 'job': removes it
- * from the list of events.
- * @param job the event to release
- */
-static inline void events_release(struct job *job)
-{
- struct job *ijob, **pjob;
-
- /* first unqueue the job */
- pjob = &first_events;
- ijob = first_events;
- while (ijob != job) {
- pjob = &ijob->next;
- ijob = ijob->next;
- }
- *pjob = job->next;
-
- /* recycle the job */
- job->next = free_jobs;
- free_jobs = job;
-}
-
-/**
- * Get the events of 'key' if existing.
- * @param key the key to search
- * @return the found events or NULL if none existing has key
- */
-static inline struct job *events_of_key(void *key)
-{
- struct job *job;
-
- if (!key)
- job = NULL;
- else {
- job = first_events;
- while (job && (job->dropped || job->group != key))
- job = job->next;
- }
- return job;
-}
-
/**
* Monitored normal callback for a job.
* This function is called by the monitor
job_call(SIGABRT, arg);
}
+/**
+ * Monitored normal callback for events.
+ * This function is called by the monitor
+ * to run the event loop when the safe environment
+ * is set.
+ * @param signum 0 on normal flow or the number
+ * of the signal that interrupted the normal
+ * flow
+ * @param arg the events to run
+ */
+static void events_call(int signum, void *arg)
+{
+ struct events *events = arg;
+ if (!signum)
+ sd_event_run(events->event, (uint64_t) -1);
+}
+
/**
* Main processing loop of threads processing jobs.
* The loop must be called with the mutex locked
* @param me the description of the thread to use
* TODO: how are timeout handled when reentering?
*/
-static void thread_run(struct thread *me)
+static void thread_run(volatile struct thread *me)
{
struct thread **prv;
struct job *job;
+ struct events *events;
/* initialize description of itself and link it in the list */
me->tid = pthread_self();
current->lowered = 1;
else
sig_monitor_init_timeouts();
- current = me;
+ current = (struct thread*)me;
me->next = threads;
- threads = me;
+ threads = (struct thread*)me;
started++;
+ NOTICE("job thread starting %d(/%d) %s", started, allowed, me->upper ? "child" : "parent");
+
/* loop until stopped */
+ me->events = NULL;
while (!me->stop) {
/* get a job */
job = job_get(first_job);
/* release the run job */
job_release(job);
+
+ /* release event if any */
+ events = me->events;
+ if (events) {
+ events->runs = 0;
+ me->events = NULL;
+ }
} else {
/* no job, check events */
- job = job_get(first_events);
- if (job) {
+ events = events_get();
+ if (events) {
/* run the events */
- job->blocked = 1;
+ events->runs = 1;
+ me->events = events;
pthread_mutex_unlock(&mutex);
- sig_monitor(job->timeout, job_call, job);
+ sig_monitor(0, events_call, events);
pthread_mutex_lock(&mutex);
- job->blocked = 0;
- if (job->dropped)
- events_release(job);
+ events->runs = 0;
+ me->events = NULL;
} else {
/* no job and not events */
waiting++;
}
}
}
+ NOTICE("job thread stoping %d(/%d) %s", started, allowed, me->upper ? "child" : "parent");
/* unlink the current thread and cleanup */
started--;
/* queues the job */
remains--;
- job_add2(job, NULL);
+ job_add(job);
/* signal an existing job */
pthread_cond_signal(&cond);
}
/**
- * Run a asynchronous job represented by 'callback'
- * with the 'timeout' but only returns after job completion.
- * @param timeout The maximum execution time in seconds of the job
- * or 0 for unlimited time.
- * @param callback The function to execute for achieving the job.
- * Its first parameter is either 0 on normal flow
- * or the signal number that broke the normal flow.
- * @return 0 in case of success or -1 in case of error
+ * Enter a synchronisation point: activates the job given by 'callback'
+ * @param group the gro
*/
-int jobs_invoke0(
+int jobs_enter(
+ void *group,
int timeout,
- void (*callback)(int signum))
+ void (*callback)(int signum, void *closure, struct jobloop *jobloop),
+ void *closure)
{
- return jobs_invoke3(timeout, (job_cb_t)callback, NULL, NULL, NULL);
-}
+
+ struct job *job;
+ struct thread me;
-/**
- * Run a asynchronous job represented by 'callback' and 'arg1'
- * with the 'timeout' but only returns after job completion.
- * @param timeout The maximum execution time in seconds of the job
- * or 0 for unlimited time.
- * @param callback The function to execute for achieving the job.
- * Its first parameter is either 0 on normal flow
- * or the signal number that broke the normal flow.
- * The remaining parameter is the parameter 'arg1'
- * given here.
- * @param arg1 The second argument for 'callback'
- * @return 0 in case of success or -1 in case of error
- */
-int jobs_invoke(
- int timeout,
- void (*callback)(int, void*),
- void *arg)
-{
- return jobs_invoke3(timeout, (job_cb_t)callback, arg, NULL, NULL);
-}
+ pthread_mutex_lock(&mutex);
-/**
- * Run a asynchronous job represented by 'callback' and 'arg[12]'
- * with the 'timeout' but only returns after job completion.
- * @param timeout The maximum execution time in seconds of the job
- * or 0 for unlimited time.
- * @param callback The function to execute for achieving the job.
- * Its first parameter is either 0 on normal flow
- * or the signal number that broke the normal flow.
- * The remaining parameters are the parameters 'arg[12]'
- * given here.
- * @param arg1 The second argument for 'callback'
- * @param arg2 The third argument for 'callback'
- * @return 0 in case of success or -1 in case of error
- */
-int jobs_invoke2(
- int timeout,
- void (*callback)(int, void*, void*),
- void *arg1,
- void *arg2)
-{
- return jobs_invoke3(timeout, (job_cb_t)callback, arg1, arg2, NULL);
+ /* allocates the job */
+ job = job_create(group, timeout, (job_cb_t)callback, closure, &me, NULL);
+ if (!job) {
+ ERROR("out of memory");
+ errno = ENOMEM;
+ pthread_mutex_unlock(&mutex);
+ return -1;
+ }
+
+ /* queues the job */
+ job_add(job);
+
+ /* run until stopped */
+ thread_run(&me);
+ pthread_mutex_unlock(&mutex);
+ return 0;
}
-/**
- * Stops the thread pointed by 'arg1'. Used with
- * invoke familly to return to the caller after completion.
- * @param signum Unused
- * @param arg1 The thread to stop
- * @param arg2 Unused
- * @param arg3 Unused
- */
-static void unlock_invoker(int signum, void *arg1, void *arg2, void *arg3)
+int jobs_leave(struct jobloop *jobloop)
{
- struct thread *t = arg1;
+ struct thread *t;
pthread_mutex_lock(&mutex);
- t->stop = 1;
- if (t->waits)
- pthread_cond_broadcast(&cond);
+
+ t = threads;
+ while (t && t != (struct thread*)jobloop)
+ t = t->next;
+ if (!t) {
+ errno = EINVAL;
+ } else {
+ t->stop = 1;
+ if (t->waits)
+ pthread_cond_broadcast(&cond);
+ }
pthread_mutex_unlock(&mutex);
+ return -!t;
}
/**
- * Run a asynchronous job represented by 'callback' and 'arg[123]'
- * with the 'timeout' but only returns after job completion.
- * @param timeout The maximum execution time in seconds of the job
- * or 0 for unlimited time.
- * @param callback The function to execute for achieving the job.
- * Its first parameter is either 0 on normal flow
- * or the signal number that broke the normal flow.
- * The remaining parameters are the parameters 'arg[123]'
- * given here.
- * @param arg1 The second argument for 'callback'
- * @param arg2 The third argument for 'callback'
- * @param arg3 The forth argument for 'callback'
- * @return 0 in case of success or -1 in case of error
+ * Gets a sd_event item for the current thread.
+ * @return a sd_event or NULL in case of error
*/
-int jobs_invoke3(
- int timeout,
- void (*callback)(int, void*, void *, void*),
- void *arg1,
- void *arg2,
- void *arg3)
+struct sd_event *jobs_get_sd_event()
{
- struct job *job1, *job2;
- struct thread me;
-
+ struct events *events;
+ struct thread *me;
+ int rc;
+
pthread_mutex_lock(&mutex);
- /* allocates the job */
- job1 = job_create(&me, timeout, callback, arg1, arg2, arg3);
- job2 = job_create(&me, 0, unlock_invoker, &me, NULL, NULL);
- if (!job1 || !job2) {
- ERROR("out of memory");
- errno = ENOMEM;
- if (job1) {
- job1->next = free_jobs;
- free_jobs = job1;
+ /* search events on stack */
+ me = current;
+ while (me && !me->events)
+ me = me->upper;
+ if (me)
+ /* return the stacked events */
+ events = me->events;
+ else {
+ /* search an available events */
+ events = events_get();
+ if (!events) {
+ /* not found, check if creation possible */
+ if (nevents >= allowed) {
+ ERROR("not possible to add a new event");
+ events = NULL;
+ } else {
+ events = malloc(sizeof *events);
+ if (events && (rc = sd_event_new(&events->event)) >= 0) {
+ if (nevents < started || start_one_thread() >= 0) {
+ events->runs = 0;
+ events->next = first_events;
+ first_events = events;
+ } else {
+ ERROR("can't start thread for events");
+ sd_event_unref(events->event);
+ free(events);
+ events = NULL;
+ }
+ } else {
+ if (!events) {
+ ERROR("out of memory");
+ errno = ENOMEM;
+ } else {
+ free(events);
+ ERROR("creation of sd_event failed: %m");
+ events = NULL;
+ errno = -rc;
+ }
+ }
+ }
}
- if (job2) {
- job2->next = free_jobs;
- free_jobs = job2;
+ if (events) {
+ /* */
+ me = current;
+ if (me) {
+ events->runs = 1;
+ me->events = events;
+ } else {
+ WARNING("event returned for unknown thread!");
+ }
}
- pthread_mutex_unlock(&mutex);
- return -1;
}
-
- /* queues the job */
- job_add2(job1, job2);
-
- /* run until stopped */
- thread_run(&me);
pthread_mutex_unlock(&mutex);
- return 0;
+ return events ? events->event : NULL;
}
/**
- * Initialise the job stuff.
- * @param allowed_count Maximum count of thread for jobs (can be 0,
- * see 'jobs_add_me' for merging new threads)
+ * Enter the jobs processing loop.
+ * @param allowed_count Maximum count of thread for jobs including this one
* @param start_count Count of thread to start now, must be lower.
* @param waiter_count Maximum count of jobs that can be waiting.
+ * @param start The start routine to activate (can't be NULL)
* @return 0 in case of success or -1 in case of error.
*/
-int jobs_init(int allowed_count, int start_count, int waiter_count)
+int jobs_start(int allowed_count, int start_count, int waiter_count, void (*start)())
{
int rc, launched;
+ struct thread me;
+ struct job *job;
- assert(allowed_count >= 0);
+ assert(allowed_count >= 1);
assert(start_count >= 0);
assert(waiter_count > 0);
assert(start_count <= allowed_count);
+ rc = -1;
+ pthread_mutex_lock(&mutex);
+
+ /* check whether already running */
+ if (current || allowed) {
+ ERROR("thread already started");
+ errno = EINVAL;
+ goto error;
+ }
+
+ /* start */
+ if (sig_monitor_init() < 0) {
+ ERROR("failed to initialise signal handlers");
+ goto error;
+ }
+
/* records the allowed count */
allowed = allowed_count;
started = 0;
remains = waiter_count;
/* start at least one thread */
- pthread_mutex_lock(&mutex);
launched = 0;
- while (launched < start_count && start_one_thread() == 0)
+ while ((launched + 1) < start_count) {
+ if (start_one_thread() != 0) {
+ ERROR("Not all threads can be started");
+ goto error;
+ }
launched++;
- rc = -(launched != start_count);
- pthread_mutex_unlock(&mutex);
+ }
- /* end */
- if (rc)
- ERROR("Not all threads can be started");
+ /* queue the start job */
+ job = job_create(NULL, 0, (job_cb_t)start, NULL, NULL, NULL);
+ if (!job) {
+ ERROR("out of memory");
+ errno = ENOMEM;
+ goto error;
+ }
+ job_add(job);
+ remains--;
+
+ /* run until end */
+ thread_run(&me);
+ rc = 0;
+error:
+ pthread_mutex_unlock(&mutex);
return rc;
}
pthread_mutex_unlock(&mutex);
}
-/**
- * Adds the events waiter/dispatcher to the list of events waiters/dispatchers
- * to monitor.
- * @param key A key to register the events waiter/dispatcher (see
- * 'jobs_del_events')
- * @param timeout Timeout in second of the function or 0 if none
- * @param events The callback, the first argument is 0 for normal
- * flow or the signal number when normal flow failed
- * @param closure The closure to give to the callback as secondd argument
- * @return 0 in case of success or -1 in case of error
- */
-int jobs_add_events(void *key, int timeout, void (*events)(int signum, void*), void *closure)
-{
- struct job *job;
-
- pthread_mutex_lock(&mutex);
-
- /* look at an already existsing events for same key */
- job = events_of_key(key);
- if (job) {
- pthread_mutex_unlock(&mutex);
- ERROR("events of key %p already exist", key);
- errno = EEXIST;
- return -1;
- }
-
- /* creates the job */
- job = job_create(key, timeout, (job_cb_t)events, closure, NULL, NULL);
- if (!job) {
- pthread_mutex_unlock(&mutex);
- ERROR("Can't create events, out of memory");
- errno = ENOMEM;
- return -1;
- }
-
- /* adds the loop */
- job->next = first_events;
- first_events = job;
-
- /* signal the loop */
- if (waiting)
- pthread_cond_signal(&cond);
- pthread_mutex_unlock(&mutex);
- return 0;
-}
-
-/**
- * Removes the events of 'key'
- * @param key The key of the events to remove
- * @return 0 in case of success or -1 in case of error
- */
-int jobs_del_events(void *key)
-{
- struct job *job;
-
- pthread_mutex_lock(&mutex);
- job = events_of_key(key);
- if (job)
- if (job->blocked)
- job->dropped = 1;
- else
- events_release(job);
- pthread_mutex_unlock(&mutex);
- if (!job) {
- ERROR("events of key %p not found", key);
- errno = ENOENT;
- }
- return -!job;
-}
-
-/**
- * Adds the current thread to the pool of threads
- * processing the jobs. Returns normally when the threads are
- * terminated or immediately with an error if the thread is
- * already in the pool.
- * @return 0 in case of success or -1 in case of error
- */
-int jobs_add_me()
-{
- struct thread me;
-
- /* check whether already running */
- if (current) {
- ERROR("thread already running");
- errno = EINVAL;
- return -1;
- }
-
- /* allowed... */
- pthread_mutex_lock(&mutex);
- allowed++;
- thread_run(&me);
- allowed--;
- pthread_mutex_unlock(&mutex);
- return 0;
-}
-
-
Code Review / src / app-framework-binder.git / blobdiff